Holtek Semiconductor HT7733
The HT77XX series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 1.8V, 2.7V, 3.0V, 3.3V, 3.7V or 5.0V.| Part No. | HT7733 |
|---|---|
| Datasheet | HT7733 Download |
| Manufacturer |  Holtek Semiconductor |
| Description | PFM Step-up DC/DC Converter |
| Buy | Stock & Price |
FEATURES
● Low start-up voltage: 0.7V (Typ.), 0.9V (Max.)● High efficiency: 85% (Typ.), VOUT³2.7V
● High output voltage accuracy: ±2.5%
● Output voltage: 1.8V, 2.7V, 3.0V, 3.3V, 3.7V, 5.0V
● Ultra low supply current IDD2: 4mA (Typ.)
● Low ripple and low noise
● Low shutdown current: 0.5mA (Typ.)
● TO-92, SOT-89, SOT-23 and SOT-25 package
APPLICATIONS
● Palmtops/PDAs● Portable communicators/Smartphones
● Cameras/Camcorders
● Battery-powered equipment
GENERAL DESCRIPTION
CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77XX consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving TO-92, SOT-89, SOT-23 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.
